Facebook Messenger Facebook Messenger is a messaging app and platform where users connect with friends, family, and businesses. It's used by billions of people worldwide for text, voice, video calls, and sharing media. Businesses also leverage it for customer support and marketing. Official docs: https://developers.facebook.com/docs/messenger-platform Facebook Messenger Overview - Conversation - Message — A single message within a conversation. - Attachment — Files, images, videos, or audio clips attached to messages. - User — Represents a Facebook user. - Group Chat — A conversation involvin…